multiple approvers at the same level workflow

Hi experts,

In our current workflow we have one approver at each level but we want to change it to multiple approvers at each level. It should function in such a way that if the primary approver is not present then the mail should be forwarded to the next approver at the same level.

If we try to do the editing in our current workflow and add multiple approvers then only the first approver of each level is picked by the system and rest of the approvers are  of no use at that level.

Can anyone suggest a way to do this? we have an urgent business requirement.Please let me know if I am missing any information.

Thanks,

Vaibhav.